Locking device



April 18, 1950 c. R. ABRAHAM LOCKING DEVICE 2 Sheets-Sheet 1 Filed Sept. so, 1946 AAAAAAAA INVENTOR. CharlesRAbmham BY M) MM.

A TTORNEYS April 18, 1950 c. R. ABRAHAM LOCKING DEVICE 2 Sheets-Sheet 2 Filed Sept. 30, 1946 FIIATI I I I I I I INVENTOR- Cbarles RA brailam BY W4,

ATTORNEYS Patented Apr. 18, 1950 UNITED STATES PATENT OFFICE LOCKING UEWE Charles R. Abraham, San Francisco;- Calit.

Application September so, sear N-o; 70121191 (Cl. @BZ IQQ) 3 Claims. 1

This invention relates to a locking device, designed particularly for use on doors, having a handle on each of the opposite faces of the door and a latching element in the door edge, whereby a push or pull movement of the respective handles either toward or from the door will disengage the latching element from the latch strike, and an oscillating movement of one of the handles will lock the latching element in engagement with the latch strike and render the other handle temporarily inoperative.

An object of the invention is to provide a lock i-ng device that will be superior in point of simplicity, inexpensiveness of construction, positive ness of operation, and facility and convenience in use and general efliciency.

In this specification and the annexed drawings, the invention is illustrated in the forms con--' sidered to be best, but it is to be understood that the invention is not limited to such forms, because it may be embodied in other forms; and it is also to be understood that in and by the claims following the description, it is desired to cover the invention in whatsoever form it may be embodied.

In the accompanying drawings: I

Figure 1 is a plan view of a locking device constructed in accordance with my invention and showing the same mounted in relation to a door and the strike plate on a door jamb;

Figure 2 is a front view of Figure 1;

Figure 3 is a section taken through Figure 1 on the line 3-3;

Figure 4 is a diagrammatic perspective view of the mechanism constituting the locking device;

Figure 5 is a plan View of a modified form of the locking device embodied in the invention;

Figure 6 is a view in section taken along lines E 5 of Figure 5;

Figure 7 is a view in section taken along lines |-'-l of Figure 5; and

Figure 8 is a view in section taken along lines 8--8 of Figure 5.

In detail the construction illustrated in Figures 14 of the drawings comprises a cylindrical liar r'el member l which is located transversely betweenthe opposite faces of a door La slight dis stance back from the edge 3 of said door.

The cover plates -t-4 are adapted to em close the opposite open ends of the barrel 1, each plate 4-4 having an annular shoulder 5 on the inside face thereof to fit within the bore of the barrel I. A set screw 5 or similar locking device is provided to hold the plates 4 4 and barrel I together.

reciarecanaglir' emirates; The plate 4' has adisposedroundhere Within which :3 $53151? is fbmfibcatin'gly" and oscillating-1 y m 'omitedt 'IF'hti shaft 1 is fb'llln'd While the shaft" '1 is fiat-sided. The inner eiicl er the" shaft 7- iii-formed to provide a recess therein in which the fina e? end of the shaft 1 is received. Suitable means connect the-inner'ends of the shafts I, E together for mutual sliding movement while, attll'dsame time; pe'i-mittihgthe round Shaft 1' to bi'dfik'd relative to" the fiat-sided shaft 1'. A knohorhandle 8=is=seciired to each-of the outer ends at the"sl'r(i?fts' l -l, there being a selected sin-cunt of space between the inner face of each haaule 8 and the outer face of each plate 4, to permit ofa reciprooative' stroke of predetermined distance or the shafts l -1", as will hereinafter be described.

A latchbdlt 9' extends out through the edge 3 0T tl'i dOor'f61 contact-with a strike plate H) on the-door 'jainb H". The latch bolt 9 has a stem l2 tl'ie1 eon vvhich-is akially slidable in a guide [3 in thebarrel I, said stem l2 being long enough ta extend across the longitudinal axis of the shafts 'l-"l-" at' right angles thereto. The extreme end of the stem l2 has a pin- M thereon. A bell c'rank has its elb'o'w l5 pivoted to the inher face of the plate 4'. One arm of the bellcrank abuts against'j the pin M' on the stem 42 Wlfil the other arm ll of the bell-crank abuts against a pin- ['8 on the shaft 1.

The other plate 4' on its inside face, is prov-icl'ed with aprojection having a notch 20 with which apiii- 2"!" on the shaft 1 is adapted to be eiigaig'e'd when the said shaft T is oscillated tm-ezrgn an-arc or about- A spring 22 is carrfecl by the plate 4 and bears against the shaft 'i" and barrel l tok'e'ep the pin 21 in a normal position-{of operation out of engagement with the notch 20 Thisi's accomplished by any suitable filc'tionalconnection between spring 22 and shaft 1, such as spring receiving notche in the shaft T, B'y turning the shaft 1 and engaging tit-apart: vi'ith'thntitch 25', it then teccmes 11m pssible'td actuate the' stem 12 of the latch bolt 9 by the" shaft-'1 and thus the door 2 is maintained ili' is ca celled locked position.

This ifarticl'ilar locking device has been designed for doors which are required to be locked and unlocked from one side only. The conned-- tibh transmit T-"=-T' permits" Said shafts to be reciprccatem-theshafit 1 by a ;push' movement and the shaft 1 by a mi mcveinem, for nor-- 3 mally disengaging the latch bolt 9 from the strike plate.

In order to lock the door in a closed position from one side only, the shaft 7' is oscillated to engage the pin 2| and slot 20. At any time and particularly when the door is in the locked position the square shaft 1 is useless for the purpose of disengaging the pin 2| from the slot 20, although said shaft 1 may be reciprocated. When the shaft 1' has been turned to disengage the pin 2| from the slot 20, then the device functions in its normal manner.

A modification of the locking device shown in Figures 5-8 is comprised of a cylindrical barrel 30, which is located transversely between the opposite faces of a door 3 I, a slight distance back from the edge 32 of said door, an annular member 33' secured within one end of the bore of the barrel 3!), and another annular member 34 secured within the opposite end of the barrel, said latter member having a flange 35 adapted to abut the door 3| to prevent transverse movement in one direction of the barrel with respect to the door. A plurality of cleats 36 secured to the annular member 33, as by screws 31, serve to prevent transverse movement in the other direction of the barrel 30.

A pair of co-axial shafts of equal diameter 38 and 39, having secured to the outer ends thereof knobs 49 and 4 are journalled for support in the annular members 33 and 34, shaft 33 being locked against rotation by a pin 42, carried by the annular member 34, extending within a longitudinal slot 43 in said shaft. A sleeve 44, press fitted or otherwise secured to the inner end of the shaft 39 so as to be non-rotatable with respect thereto, has a pair of diametrically opposed apertures having extending therethrough a key 45 and a catch button 46 yieldingly urged apart by a spring 47. The key 45 extends into an arcuate keyway 48 in the shaft 39 and the catch button 46 is adapted to selectively register with either of a pair of radially spaced apertures 49 in the shaft 39 as said shaft is rotated, for a purpose which will hereinafter appear. Shaft 39 is therefore locked for longitudinal travel with the shaft 38 by the key 45 while being relatively rotatable therewith.

A latch bolt guide, comprised of a plate 5| secured to the edge of the door 3| and a pair of arms 52 extending into open ended slots 53 in the barrel 39 to secure said barrel against rotation, contains a latch bolt 54 having a stem 55 extending through a slot 55 in the barrel 39 and through a cliametral slot 57 in the shaft 38.. The stem 55 has a rectangular locking aperture- 58 therethrough, and an open ended cam slot 59 is also provided in the stem, said slot having a cam surface 69 adapted to be engaged by a pin 6| secured at each end to the internal surface of. the shaft 38. The stem 55 is symmetrically cut away to provide guide tongues 52 and 63 for a spring 54 hearing against the barrel 30 and the latch bolt 54.

A locking arm 65 secured at one end to the shaft 39 is bent at a right angle to pass through a radial slot 66 in the annular member 33, said arm having a downwardly and reversely bent tongue 61, as shown most clearly in Figures 5 and 7, adapted to extend in one position of the arm 65 through the locking aperture 58 in the stem 55.

Annular cover plates 68 and 69 secured to opposite faces of the door 3| complete the structure of the locking device.

When the locking arm 65 is in the upper post-- tion of Figure '7, the catch button 46 is in registration with the lower aperture 49, as seen in Figure 8, and the locking device is in the unlocked position. The device is then operable to unlatch the door from the door jamb, not shown, in the following manner. A push on knob or a pull on knob 4| is effective to move shafts 38 and 39 transversely of the barrel 30 to cause the pin 6! to move along the cam face 60 of the cam slot to move the stem 55 inwardly of the barrel through the slot 56 therein and withdraw the latch bolt 54 from the door jamb against the opposing force of the spring 64 As this occurs, the locking arm 65 is withdrawn through the radial slot 65 in the annular member 33 to the position shown in dotted outline in Figure 5. The door 3| may then be opened.

When the hand of the operator is removed from either of the knobs 40 or 4|, the stem 55 and shafts 38 and 39 are returned to the position of Figure 5 by the spring 64.

The relatively slight frictional engagement between the button 46 and the aperture 49 is sufficient to prevent an accidental rotation of th shaft 39 and possible locking of the device when this result is not desired. An intentional lockin of the device may be had by turning the knob 4| so as to rotate the shaft 39 in a clockwise direction, as viewed in Figure 7. The shaft 35 is rotated until the button 46 audibly snaps into engagement with the other of the two apertures 49 in the shaft 39. The arm 65 is thus moved within the radial slot 66 to the lower position of Figure '7 to move the tongue 6'1 of the arm within the locking aperture 58 in the stem 55. Any attempt to open the door by a transverse movement of the shafts 38 and 39 therein is now thwarted, since a slight movement of said shafts is effective to bring the tongue: 61 into engagement with the side of the aperture 58 to prevent further relative movement between the pin 6| and the cam face before the latch bolt 54 is freed from the door jamb.

In the event that the door is closed with the arm in the locking position, damage to the latch bolt 54 is prevented since the latch bolt is forcibly moved inwardly by the door jamb to cause the slightly inclined end of the locking aperture to strike the reversely bent portion of the tongue 61 and pivot the locking arm to the unlocking position, as best shown in Figure 7.

It is apparent from an examination of the drawings that the structure of the locking device of the modification prevents the occurrence of a situation where the device is thought to be in a locked position, when it is in fact not locked. For example, if the latch bolt 54 should happen to be retained in the withdrawn position after the device has been operated to open the door, the operator, upon closing the door and turning the knob 4| toward the locking position, cannot reasonably be led to believe that the door is locked, since the locking aperture 58 is not in position where the tongue 61 can be depressed therein. This being so, the knob 4| will not be rotatable in the degree necessary to normally accomplish the locking of the door, and the button 46 will not audibly snap .into registration with one of the apertures 49 in the shaft 39 to indicate to the operator that the device is in the locking position.

What I claim as new and desire to secure by Letters Patent is:

1. In a locking device, including a latch bolt and means mounting said latch bolt for reciprocal movement into and out of a locking position; means for actuating said bolt, comprising a pair of axially aligned shafts, means mounting one of said shafts for sliding movement at right angles to said bolt, means mounting the other shaft for similar sliding movement and also for rotary movement, handles fixed on the outer ends of said shafts, means connecting the adjacent inner ends of said shafts together for mutual sliding movement but adapted to permit rotary movement of said second shaft relative to said first shaft, an operative connection between said first shaft and said bolt and adapted to reciprocate said bolt upon sliding movement of said shafts, and means carried by said second shaft adapted to be engaged with the latch bolt when said second shaft is rotated to lock both shafts against sliding movement, said means being adapted to be moved out of engagement with said latch bolt to free the shafts for sliding movement wpon the application of a force directly to the latch bolt sufiicient to urge said latch bolt to an unlocking position.

2. In a locking device, including a latch bolt and means mounting said latch bolt for reciprocal movement into and out of a locking position, means for actuating said bolt comprising a shaft, means mounting said shaft for sliding movement at right angles to said bolt, handles fixed on the outer ends of said shaft, an opera tive connection between said shaft and said bolt and adapted to reciprocate said bolt upon sliding movement of said shaft, and means adapted to be engaged with the latch bolt to lock the shaft against sliding movement, said means being adapted to be moved out of engagement with said latch bolt to free the shaft for sliding movement upon the application of a force directly to the latch bolt normally suificient to urge said latch bolt to an unlocking position.

3. In a locking device, including a latch bolt and means mounting said latch belt for reciprocal movement into and out of a'locking position, means for actuating said bolt comprising a shaft, means mounting said shaft for sliding movement at right angles to said bolt, handles fixed on the outer ends of said shaft, an operative connection between said shaft and said bolt and adapted to reciprocate said bolt upon sliding movement of said shaft, and locking means associated with said shaft adapted to be engaged with the latch bolt to lock the shaft against sliding movement, said locking means being such that the shaft cannot be locked against sliding movement when the latch bolt is withdrawn a predetermined degree from its normal locking position.

CHARLES R. ABRAHAM.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,565,212 Sillick Dec. 8, 1925 1,991,822 Snipes Feb. 19, 1935 FOREIGN PATENTS Number Country Date 40,266 Germany Aug. 4, 1887 326,872 Germany Oct. 4, 1920 

